Please try the following:
1. Open two project tabs with different projects
2. Play Project 1, stop and observe the peak and RMS measured by the master track
3. Switch tab, and play Project 2, stop and observe the peak and RMS measured by the master track
4. Switch back to first project

What happens:
The RMS on Project 1 master track is now set to the RMS measured for Project 2. Peak values for Project 1 are not changed, only the RMS values.

What I expected:
That Project 1 should keep its RMS values when not playing.

This is Reaper 4.591 x86 on W7x64.

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// MVHMF
I never always did the right thing, but all I did wasn't wrong...